free-for-all \free-for-all\ n.
1. a noisy and disordered fight conducted without rules.
Syn: brawl.
[WordNet 1.5]
2. Hence: Any vigorous competition in which anyone can
compete, with few or no rules, and in which the winner is
unpredictable; as, when they began to distribute the free
food, the orderly line of hungry recipients degenerated
into a free-for-all.
[PJC]